[XML & Databases 2]: Additional assignment opportunities

Due to the much larger number of students than we expected, we perhaps need to have additional assignments to accomodate everybody. This will be done on a per theme-basis, i.e. we will assign more project groups to a theme than there are assignments. On the first theme meeting, we will explain which other possible assignments can be done, so we can discuss what each group is going to do. If desired, there is the opportunity to switch assignment within the theme.